Hi there- In today's bad/low condo market, you could get a 2 BR unit for not much more than a 1 BR unit. So as you said, the 2 BR unit will sell much easier later (and at a higher price).
Definitely check out the condo bylaws; you'll need to be able to rent it out if needed. Paying for 2 mortgages can lead to ruin very quickly.
Also, make sure that anything you do within the unit is allowable under the condo bylaws as well. Anything that touches or changes the exterior of the Unit you cannot alter.
If you'd like any other help, please let me know. Thanks,
PS- Also make sure you aren't too loud doing renovations while people live above/ below you and all next to you as well. Not quite as easy as a SF property...